Pc Specs: GTX 1080Ti, i7 8700k, 32GB RAM, 1TB SSD, 2TB HDD, Aorus Z370 Mobo. So I launched GTA 4 day before yesterday, a daily routine, and noticed that the load time has increased by about 1 min (it usually takes upto just 20 secs since it's on my SSD). Ignored it thinking it was a one time issue but as I continued to play the game I noticed that the game was very grainy and artifact-y, the FPS was locked to 60 and as I kept playing it kept fluctuating ranging from 1-60, frame time went above 130ms regularly. The same happened with Batman Arkham Knight(on my HDD). I checked my OC settings, changed it to default but the results were the same. Even double checked the nvidia control panel settings, nothing was changed. And this was very sudden. I launched Hitman 2 (SSD) to check if it had the same issue but it didn't, it functioned and looked just fine. I've launched and played multiple games since and so far I haven't noticed any pattern as to which games are affected due to this issue, it's very random. Below is the userbenchmark of my system.
Userbenchmark results
Userbenchmark results